The benthic litter-dwelling macrofauna of the Amazonian forest stream Tarumã-Mirím: patterns of colonization and their implications for community stability

Hydrobiologia ◽  
1994 ◽  
Vol 291 (2) ◽  
pp. 75-92 ◽  
Author(s):  
I. Walker
Keyword(s):  
Community Stability ◽  
Amazonian Forest ◽  
Forest Stream

scholarly journals Drivers of leafcutter ant populations and their inter‐trophic relationships in Amazonian forest islands

Ecosphere ◽  
2021 ◽  
Vol 12 (5) ◽  
Author(s):  
Ana Filipa Palmeirim ◽  
Maíra Benchimol ◽  
Inara R. Leal ◽  
Carlos A. Peres
Keyword(s):  
Trophic Relationships ◽  
Amazonian Forest ◽  
Forest Islands

scholarly journals Substrate-dependent competition and cooperation relationships between Geobacter and Dehalococcoides for their organohalide respiration

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Yongyi Liang ◽  
Qihong Lu ◽  
Zhiwei Liang ◽  
Xiaokun Liu ◽  
Wenwen Fang ◽  
...  
Keyword(s):  
Electron Donors ◽  
Community Stability ◽  
Organohalide Respiration ◽  
Competition And Cooperation ◽  
Free Competition ◽  
Isolation And Characterization ◽  
Geochemical Cycling ◽  
New Strategy ◽  
Insight Into

AbstractObligate and non-obligate organohalide-respiring bacteria (OHRB) play central roles in the geochemical cycling and environmental bioremediation of organohalides. Their coexistence and interactions may provide functional redundancy and community stability to assure organohalide respiration efficiency but, at the same time, complicate isolation and characterization of specific OHRB. Here, we employed a growth rate/yield tradeoff strategy to enrich and isolate a rare non-obligate tetrachloroethene (PCE)-respiring Geobacter from a Dehalococcoides-predominant microcosm, providing experimental evidence for the rate/yield tradeoff theory in population selection. Surprisingly, further physiological and genomic characterizations, together with co-culture experiments, revealed three unique interactions (i.e., free competition, conditional competition and syntrophic cooperation) between Geobacter and Dehalococcoides for their respiration of PCE and polychlorinated biphenyls (PCBs), depending on both the feeding electron donors (acetate/H2 vs. propionate) and electron acceptors (PCE vs. PCBs). This study provides the first insight into substrate-dependent interactions between obligate and non-obligate OHRB, as well as a new strategy to isolate fastidious microorganisms, for better understanding of the geochemical cycling and bioremediation of organohalides.

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